So hold your stash 'til the coke price drop

Lyric Meaning

Since the snitch is getting a lot of drug dealers “knocked” (slang for “arrested”), now is not a good time to be spending your “stash” of money on drug purchases.

1: You could get in trouble

and

2: You’ll get more favorable prices if you wait for the market to adjust

Following the principle of supply and demand, higher cocaine prices could indicate that cocaine distribution is more dangerous (because of police or other reasons). Keep your supply of cocaine until the price goes down, then you’ll know that it’s safer to be on the streets.